Time base corrector
US4905101A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1988 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Jul 7, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/95
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disclosed time base corrector comprises a clock generater for generating a clock signal whose period is fixed, an analog-to-digital converter for sampling amplitude values of an input analog signal having a time base error at sampling points given by the clock signal, an adaptive interpolation filter for interpolating a correct amplitude value at a resampling indicated by a resampling position signal, a resampling position signal producing circuit for detecting the time base error and producing from the detected error the resampling position signal, and a digital-to-analog converter for converting the interpolated amplitude values to an analog signal which has no time base errors. The time base correction is implemented by pure digital signal processing without any analog signal processing. The time base corrector does not use such a clock signal that has time base fluctuations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.